I have Casio Ctk-496 and I have MIDI-USB wire. It all works, but Transpose button doesn't transpose and casio chord doesn't work with my computer. And all is still working even if I pull out IN wire from my Casio.

Here is the link for the manual - according to it:
Use the TRANSPOSE/FUNCTION button
to perform the system reset operation.

http://support.casio.com/pdf/008/ctk_691_01_e.pdf

What is the model of your sound card?

You can play back standard MIDI files from the SD card slot, or load them into memory via USB. However, it is not possible to add new tones or rhythms.

You have to install the MIDI type software in the PC to trigger the sound card's voices. You may also need a driver for the keyboard. Search the Casio site for downloads pertaining to your keyboard.

ASSUMING you have a MIDI interface connection, (not audio) then you need to set the PC to use a general MIDI sound and turn on the synth in the PC.

Go to control panel and open the sound icon. Select the device to use for MIDI playback in the appropriate section.

Oh, oh... that is often called the "Dreaded MIDI Drone".

There ccan be more than one causes, however two of those are this:

1. The receiving device either does or does not respond to the note off command or only responds to the note on command with zero velocity, which is also now interpreted as note off. Check the MIDI implementation chart to determine this.

2. Two MIDI commands have merged without using a MIDI merger which makes sure ONLY complete MIDI commands are sent. If the commands are mixed, dreaded MIDI drone is assured.

You can use this keyboard via MIDI to send note on/off information to FriutyLoops. Use for control functions will be somewhat limited to voice change, velocity, and aftertouch.

Unfortunately your model of Casio only has midi in and not midi out. You will be able to use it as an external sound module but not to input notes into Fruity Loops. In other words midi out of your computer to midi in of the Casio with the proper settings will play your Fruity Loops sequences through the Casio.

Try downloading MidiOx and troubleshooting with it. It will show you if you have any midi activity and which channel your Casio is transmitting on etc.